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Fix: Fixed a reading bug in MODBUS-RTU when using DMA #105

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Fix: Fixed a reading bug in MODBUS-RTU when using DMA #105

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5 changes: 5 additions & 0 deletions examples/stm32/nmbs/port.c
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Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,11 @@ int32_t write_socket(const uint8_t* buf, uint16_t count, int32_t byte_timeout_ms
#ifdef NMBS_RTU
static int32_t read_serial(uint8_t* buf, uint16_t count, int32_t byte_timeout_ms, void* arg) {
#if MB_UART_DMA
if(byte_timeout_ms==0)
{
xQueueReset(rtu_rx_q);
return 0;
}
uint32_t tick_start = HAL_GetTick();
while (uxQueueMessagesWaiting(rtu_rx_q) < count) {
if (HAL_GetTick() - tick_start >= (uint32_t) byte_timeout_ms) {
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